Koebner phenomenon refers to what?

Koebner phenomenon refers to what?

• A. New lesions forming at sites of trauma
• B. Spontaneous resolution
• C. Transmission via respiratory droplets
• D. Hypersensitivity to metal implants

Answer: (A)

New lesions forming at sites of trauma is what the Koebner phenomenon describes. This is an isomorphic response seen in conditions like psoriasis, where skin injury from scratching, surgery, or friction can trigger psoriatic plaques to appear along the damaged areas. Local inflammatory signals and immune activation in predisposed individuals lead to keratinocyte proliferation at the injured site. This pattern is distinct from spontaneous resolution, contagious transmission, or hypersensitivity to metal implants, which involve different processes. In clinical terms, you might see new plaques develop on an area of skin that has been scratched or injured, even if the rest of the skin remains unaffected.

New lesions forming at sites of trauma is what the Koebner phenomenon describes. This is an isomorphic response seen in conditions like psoriasis, where skin injury from scratching, surgery, or friction can trigger psoriatic plaques to appear along the damaged areas. Local inflammatory signals and immune activation in predisposed individuals lead to keratinocyte proliferation at the injured site. This pattern is distinct from spontaneous resolution, contagious transmission, or hypersensitivity to metal implants, which involve different processes. In clinical terms, you might see new plaques develop on an area of skin that has been scratched or injured, even if the rest of the skin remains unaffected.